/// <summary>Checks a trackball event.</summary>
/// <remarks>Checks a trackball event.</remarks>
/// <param name="event">The event.</param>
/// <param name="nestingLevel">
/// The nesting level: 0 if called from the base class,
/// or 1 from a subclass. If the event was already checked by this consistency verifier
/// at a higher nesting level, it will not be checked again. Used to handle the situation
/// where a subclass dispatching method delegates to its superclass's dispatching method
/// and both dispatching methods call into the consistency verifier.
/// </param>
public void onTrackballEvent(android.view.MotionEvent @event, int nestingLevel)
{
if (!startEvent(@event, nestingLevel, EVENT_TYPE_TRACKBALL))
{
return;
}
try
{
ensureMetaStateIsNormalized(@event.getMetaState());
int action = @event.getAction();
int source = @event.getSource();
if ((source & android.view.InputDevice.SOURCE_CLASS_TRACKBALL) != 0)
{
switch (action)
{
case android.view.MotionEvent.ACTION_DOWN:
{
if (mTrackballDown && !mTrackballUnhandled)
{
problem("ACTION_DOWN but trackball is already down.");
}
else
{
mTrackballDown = true;
mTrackballUnhandled = false;
}
ensureHistorySizeIsZeroForThisAction(@event);
ensurePointerCountIsOneForThisAction(@event);
break;
}
case android.view.MotionEvent.ACTION_UP:
{
if (!mTrackballDown)
{
problem("ACTION_UP but trackball is not down.");
}
else
{
mTrackballDown = false;
mTrackballUnhandled = false;
}
ensureHistorySizeIsZeroForThisAction(@event);
ensurePointerCountIsOneForThisAction(@event);
break;
}
case android.view.MotionEvent.ACTION_MOVE:
{
ensurePointerCountIsOneForThisAction(@event);
break;
}
default:
{
problem("Invalid action " + android.view.MotionEvent.actionToString(action) + " for trackball event."
);
break;
}
}
if (mTrackballDown && @event.getPressure() <= 0)
{
problem("Trackball is down but pressure is not greater than 0.");
}
else
{
if (!mTrackballDown && @event.getPressure() != 0)
{
problem("Trackball is up but pressure is not equal to 0.");
}
}
}
else
{
problem("Source was not SOURCE_CLASS_TRACKBALL.");
}
}
finally
{
finishEvent();
}
}
private void setContext(android.view.MotionEvent curr)
{
if (mCurrEvent != null)
{
mCurrEvent.recycle();
}
mCurrEvent = android.view.MotionEvent.obtain(curr);
mCurrLen = -1;
mPrevLen = -1;
mScaleFactor = -1;
android.view.MotionEvent prev = mPrevEvent;
int prevIndex0 = prev.findPointerIndex(mActiveId0);
int prevIndex1 = prev.findPointerIndex(mActiveId1);
int currIndex0 = curr.findPointerIndex(mActiveId0);
int currIndex1 = curr.findPointerIndex(mActiveId1);
if (prevIndex0 < 0 || prevIndex1 < 0 || currIndex0 < 0 || currIndex1 < 0)
{
mInvalidGesture = true;
android.util.Log.e(TAG, "Invalid MotionEvent stream detected.", new System.Exception
());
if (mGestureInProgress)
{
mListener.onScaleEnd(this);
}
return;
}
float px0 = prev.getX(prevIndex0);
float py0 = prev.getY(prevIndex0);
float px1 = prev.getX(prevIndex1);
float py1 = prev.getY(prevIndex1);
float cx0 = curr.getX(currIndex0);
float cy0 = curr.getY(currIndex0);
float cx1 = curr.getX(currIndex1);
float cy1 = curr.getY(currIndex1);
float pvx = px1 - px0;
float pvy = py1 - py0;
float cvx = cx1 - cx0;
float cvy = cy1 - cy0;
mPrevFingerDiffX = pvx;
mPrevFingerDiffY = pvy;
mCurrFingerDiffX = cvx;
mCurrFingerDiffY = cvy;
mFocusX = cx0 + cvx * 0.5f;
mFocusY = cy0 + cvy * 0.5f;
mTimeDelta = curr.getEventTime() - prev.getEventTime();
mCurrPressure = curr.getPressure(currIndex0) + curr.getPressure(currIndex1);
mPrevPressure = prev.getPressure(prevIndex0) + prev.getPressure(prevIndex1);
}
